Kenwood KRC-V791, Service Manual

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KRC-V791
4
MICROCOMPUTER'S TERMINAL DESCRIPTION
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UPD703033GC138 (IC1: X14-)
SYSTEM MICROCOMPUTER
Pin Name I/O Purpose Operation Description
1 AM+B O AM power supply terminal. During AM operation: H.
2 FM+B O FM power supply terminal. During FM operation: H. Last FM with RDS model: H
3 AFS O Constant switching when noise is detected. During FM seek or AM search: L. During reception: H.
4 PLL-DATA I/O DATA input/output terminal from/to F/E.
5 PLL-CLK I/O CLOCK input/output terminal from/to F/E.
6 Evdd - Positive power supply terminal.
7 GND - Grounding terminal.
8 N.C O No connection.
9 BEEP O Beep output terminal.
10 REMO I Remote control input terminal.
11 P-ON O SW 14 V control terminal. Power ON: H. Power OFF: L.
12 P-STBY O Power IC STBY terminal control. Power IC OFF: L. Power IC ON: H. During reset: Input.
13 IC2-SDA I/O IC2 DATA line.
14 IC2-SCK O IC2 CLOCK line.
15 P-MUTE O Power IC muting terminal. Power OFF: L. All OFF: L. During TEL muting: L.
16 PRE-MUTE O Pre-Out muting terminal. During momentary power down: L.
17 D/A-SDA/DIM-CON O D/A data line (V-LED).
18 TEST - Test pin.
19 P-CON O Power control terminal. Power ON: H. Power OFF: L.
20 ANT-CON O Antenna control terminal. TUNER, TI ON: H
21 MUTE O Muting terminal.
ON: Open. OFF: L.
The time constant is 0.48 ms with all models.
22 N.C O No connection.
23 ACC-DET I Acc detection terminal. Acc detected: L. Acc not detected: H.
24 DIMMER I Small detection terminal. ON: L. OFF: H.
25 SW-5V O 5 V power supply terminal. ON: L. OFF: H.
26 CH-MUTE I Muting request from CH. ON: H. OFF: L.
27 CH-CON O CH control output. ON: H. OFF: L.
28 CH-REQH O Request output to CH. Requested: L.
29 CH-RST O Reset output to CH.
Normal: L. When the system is reset, turns H then
L in 400 ms after recovery from reset.
30 EXT-AMP-CONT O External amplifier control terminal (In 200 ms).
L 40 ms: Bass boost OFF. L 70 ms: Bass boost LOW.
L 100 ms: Bass boost HIGH.
31 RESET I Reset input terminal Normal: H. Reset: L.
32 XT1 I Sub-clock connection terminal. The clock count is active even when Power is OFF.
33 XT2 - Sub-clock connection terminal.
34 REGC -
Output terminal for the capacitor in the regulator
in
µ
-COM.
35 X2 - Main clock connection terminal.
Power ON: Oscillated.
Power OFF or momentary power down: Oscillation stopped.
36 X1 I Main clock connection terminal.
37 Vss - Grounding terminal.
38 Vdd - Positive power supply terminal.
39 CLKOUT O Internal System Clock output.
40 N.C O No connection.
41 MOTOR O Cassette mechanism main motor output terminal. When the motor is running: H. When it is stopped: L.
42 MODE3 I Cassette mechanism mode detection terminal.
43 MODE1 I Cassette mechanism mode detection terminal.
44 MODE2 I Cassette mechanism mode detection terminal.
45 N.C O Outputs Low. No connection.
46 SUB1 O Sub-motor output terminal (1).
47 SUB2 O Sub-motor output terminal (2).
48 SUB3 O Sub-motor output terminal (3).
49 CAS/SRM O
Cassette mechanism/SRM mechanism Cassette mechanism: H.
voltage switching terminal. SRM mechanism: L.
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